<"appId" => $config['appid'],
      "timeStamp" => $timestamp,
      "nonceStr" => self::createNonceStr(),
      "package" => "prepay_id=" . $unifiedOrder->prepay_id,
      "signType" => 'MD5',
    );
    $arr['paySign'] = self::getSign($arr, $config['key']);
    return $arr;
  }
  public function notify()
  {
    $config = array(
      'mch_id' => $this->mchid,
      'appid' => $this->appid,
      'key' => $this->key,
    );
    $postStr = $GLOBALS["HTTP_RAW_POST_DATA"];
    //error_log($postStr, 3, './str.txt');
    /*
    $postStr = '<xml>
    <appid><![CDATA[wx00e5904efec77699]]></appid>
    <attach><![CDATA[支付测试]]></attach>
    <bank_type><![CDATA[CMB_CREDIT]]></bank_type>
    <cash_fee><![CDATA[1]]></cash_fee>
    <fee_type><![CDATA[CNY]]></fee_type>
    <is_subscribe><![CDATA[Y]]></is_subscribe>
    <mch_id><![CDATA[1220647301]]></mch_id>
    <nonce_str><![CDATA[a0tZ41phiHm8zfmO]]></nonce_str>
    <openid><![CDATA[oU3OCt5O46PumN7IE87WcoYZY9r0]]></openid>
    <out_trade_no><![CDATA[550bf2990c51f]]></out_trade_no>
    <result_code><![CDATA[SUCCESS]]></result_code>
    <return_code><![CDATA[SUCCESS]]></return_code>
    <sign><![CDATA[F6F519B4DD8DB978040F8C866C1E6250]]></sign>
    <time_end><![CDATA[20150320181606]]></time_end>
    <total_fee>1</total_fee>
    <trade_type><![CDATA[JSAPI]]></trade_type>
    <transaction_id><![CDATA[1008840847201503200034663980]]></transaction_id>
    </xml>';
    */
    $postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);
    if ($postObj === false) {
      die('parse xml error');
    }
    if ($postObj->return_code != 'SUCCESS') {
      die($postObj->return_msg);
    }
    if ($postObj->result_code != 'SUCCESS') {
      die($postObj->err_code);
    }
    $arr = (array)$postObj;
    unset($arr['sign']);
    if (self::getSign($arr, $config['key']) == $postObj->sign) {
      // $mch_id = $postObj->mch_id; //微信支付分配的商户号
      // $appid = $postObj->appid; //微信分配的公众账号ID
      // $openid = $postObj->openid; //用户在商户appid下的唯一标识
      // $transaction_id = $postObj->transaction_id;//微信支付订单号
      // $out_trade_no = $postObj->out_trade_no;//商户订单号
      // $total_fee = $postObj->total_fee; //订单总金额，单位为分
      // $is_subscribe = $postObj->is_subscribe; //用户是否关注公众账号，Y-关注，N-未关注，仅在公众账号类型支付有效
      // $attach = $postObj->attach;//商家数据包，原样返回
      // $time_end = $postObj->time_end;//支付完成时间
      echo '<xml><return_code><![CDATA[SUCCESS]]></return_code><return_msg><![CDATA[OK]]></return_msg></xml>';
      return $postObj;
    }
  }
  /**
   * curl get
   *
   * @param string $url
   * @param array $options
   * @return mixed
   */
  public static function curlGet($url = '', $options = array())
  {
    $ch = curl_init($url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_TIMEOUT, 30);
    if (!empty($options)) {
      curl_setopt_array($ch, $options);
    }
    //https请求 不验证证书和host
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
    $data = curl_exec($ch);
    curl_close($ch);
    return $data;
  }
  public static function curlPost($url = '', $postData = '', $options = array())
  {
    if (is_array($postData)) {
      $postData = http_build_query($postData);
    }
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_POST, 1);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $postData);
    curl_setopt($ch, CURLOPT_TIMEOUT, 30); //设置cURL允许执行的最长秒数
    if (!empty($options)) {
      curl_setopt_array($ch, $options);
    }
    //https请求 不验证证书和host
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
    $data = curl_exec($ch);
    curl_close($ch);
    return $data;
  }
  public static function createNonceStr($length = 16)
  {
    $chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
    $str = '';
    for ($i = 0; $i < $length; $i++) {
      $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
    }
    return $str;
  }
  public static function arrayToXml($arr)
  {
    $xml = "<xml>";
    foreach ($arr as $key => $val) {
      if (is_numeric($val)) {
        $xml .= "<" . $key . ">" . $val . "</" . $key . ">";
      } else
        $xml .= "<" . $key . "><![CDATA[" . $val . "]]></" . $key . ">";
    }
    $xml .= "</xml>";
    return $xml;
  }
  /**
   * 例如：
   * appid：  wxd930ea5d5a258f4f
   * mch_id：  10000100
   * device_info： 1000
   * Body：  test
   * nonce_str： ibuaiVcKdpRxkhJA
   * 第一步：对参数按照 key=value 的格式，并按照参数名 ASCII 字典序排序如下：
   * stringA="appid=wxd930ea5d5a258f4f&body=test&device_info=1000&mch_i
   * d=10000100&nonce_str=ibuaiVcKdpRxkhJA";
   * 第二步：拼接支付密钥：
   * stringSignTemp="stringA&key=192006250b4c09247ec02edce69f6a2d"
   * sign=MD5(stringSignTemp).toUpperCase()="9A0A8659F005D6984697E2CA0A9CF3B7"
   */
  public static function getSign($params, $key)
  {
    ksort($params, SORT_STRING);
    $unSignParaString = self::formatQueryParaMap($params, false);
    $signStr = strtoupper(md5($unSignParaString . "&key=" . $key));
    return $signStr;
  }
  protected static function formatQueryParaMap($paraMap, $urlEncode = false)
  {
    $buff = "";
    ksort($paraMap);
    foreach ($paraMap as $k => $v) {
      if (null != $v && "null" != $v) {
        if ($urlEncode) {
          $v = urlencode($v);
        }
        $buff .= $k . "=" . $v . "&";
      }
    }
    $reqPar = '';
    if (strlen($buff) > 0) {
      $reqPar = substr($buff, 0, strlen($buff) - 1);
    }
    return $reqPar;
  }
}